Suppose that 60% of all college students study only during the night before a test. Let x be the number of students who study only during the night before a test, among 11 r/s college students. Facts: P(x=8) = 0.177, P(x=9) =0.089, P(x=10) = 0.027 and P(x=11) = 0.004. Find the probability that x is at most 9. Find the mean and s.d. of x. (a) (b)

Suppose that 60% of all college students study only during the night before a test. Let x be the number of students who study only during the night before a test, among 11 r/s college students. Facts: P(x=8) = 0.177, P(x=9) =0.089, P(x=10) = 0.027 and P(x=11) = 0.004. Find the probability that x is at most 9. Find the mean and s.d. of x. (a) (b)

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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